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Upgrade to 2022-era LLVM LIBCXX
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Justine Tunney
parent
2f4ca71f26
commit
8e68384e15
2078 changed files with 165657 additions and 65010 deletions
242
third_party/libcxx/__memory/pointer_traits.h
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242
third_party/libcxx/__memory/pointer_traits.h
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// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MEMORY_POINTER_TRAITS_H
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#define _LIBCPP___MEMORY_POINTER_TRAITS_H
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#include <__config>
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#include <__memory/addressof.h>
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#include <__type_traits/conditional.h>
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#include <__type_traits/conjunction.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/is_class.h>
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#include <__type_traits/is_function.h>
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#include <__type_traits/is_void.h>
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#include <__type_traits/void_t.h>
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#include <__utility/declval.h>
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#include <cstddef>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp, class = void>
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struct __has_element_type : false_type {};
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template <class _Tp>
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struct __has_element_type<_Tp, __void_t<typename _Tp::element_type> > : true_type {};
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template <class _Ptr, bool = __has_element_type<_Ptr>::value>
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struct __pointer_traits_element_type;
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template <class _Ptr>
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struct __pointer_traits_element_type<_Ptr, true>
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{
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typedef _LIBCPP_NODEBUG typename _Ptr::element_type type;
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args>
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struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, true>
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{
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typedef _LIBCPP_NODEBUG typename _Sp<_Tp, _Args...>::element_type type;
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args>
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struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, false>
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{
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typedef _LIBCPP_NODEBUG _Tp type;
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};
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template <class _Tp, class = void>
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struct __has_difference_type : false_type {};
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template <class _Tp>
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struct __has_difference_type<_Tp, __void_t<typename _Tp::difference_type> > : true_type {};
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template <class _Ptr, bool = __has_difference_type<_Ptr>::value>
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struct __pointer_traits_difference_type
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{
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typedef _LIBCPP_NODEBUG ptrdiff_t type;
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};
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template <class _Ptr>
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struct __pointer_traits_difference_type<_Ptr, true>
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{
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typedef _LIBCPP_NODEBUG typename _Ptr::difference_type type;
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};
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template <class _Tp, class _Up>
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struct __has_rebind
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{
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private:
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template <class _Xp> static false_type __test(...);
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Xp> static true_type __test(typename _Xp::template rebind<_Up>* = 0);
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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public:
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static const bool value = decltype(__test<_Tp>(0))::value;
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};
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template <class _Tp, class _Up, bool = __has_rebind<_Tp, _Up>::value>
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struct __pointer_traits_rebind
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{
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#ifndef _LIBCPP_CXX03_LANG
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typedef _LIBCPP_NODEBUG typename _Tp::template rebind<_Up> type;
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#else
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typedef _LIBCPP_NODEBUG typename _Tp::template rebind<_Up>::other type;
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#endif
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args, class _Up>
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struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, true>
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{
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#ifndef _LIBCPP_CXX03_LANG
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typedef _LIBCPP_NODEBUG typename _Sp<_Tp, _Args...>::template rebind<_Up> type;
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#else
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typedef _LIBCPP_NODEBUG typename _Sp<_Tp, _Args...>::template rebind<_Up>::other type;
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#endif
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args, class _Up>
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struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, false>
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{
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typedef _Sp<_Up, _Args...> type;
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};
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template <class _Ptr>
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struct _LIBCPP_TEMPLATE_VIS pointer_traits
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{
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typedef _Ptr pointer;
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typedef typename __pointer_traits_element_type<pointer>::type element_type;
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typedef typename __pointer_traits_difference_type<pointer>::type difference_type;
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#ifndef _LIBCPP_CXX03_LANG
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template <class _Up> using rebind = typename __pointer_traits_rebind<pointer, _Up>::type;
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#else
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template <class _Up> struct rebind
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{typedef typename __pointer_traits_rebind<pointer, _Up>::type other;};
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#endif // _LIBCPP_CXX03_LANG
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private:
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struct __nat {};
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public:
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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static pointer pointer_to(__conditional_t<is_void<element_type>::value, __nat, element_type>& __r)
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{return pointer::pointer_to(__r);}
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};
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS pointer_traits<_Tp*>
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{
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typedef _Tp* pointer;
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typedef _Tp element_type;
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typedef ptrdiff_t difference_type;
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#ifndef _LIBCPP_CXX03_LANG
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template <class _Up> using rebind = _Up*;
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#else
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template <class _Up> struct rebind {typedef _Up* other;};
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#endif
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private:
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struct __nat {};
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public:
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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static pointer pointer_to(__conditional_t<is_void<element_type>::value, __nat, element_type>& __r) _NOEXCEPT
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{return _VSTD::addressof(__r);}
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};
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#ifndef _LIBCPP_CXX03_LANG
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template <class _From, class _To>
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using __rebind_pointer_t = typename pointer_traits<_From>::template rebind<_To>;
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#else
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template <class _From, class _To>
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using __rebind_pointer_t = typename pointer_traits<_From>::template rebind<_To>::other;
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#endif
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// to_address
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template <class _Pointer, class = void>
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struct __to_address_helper;
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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_Tp* __to_address(_Tp* __p) _NOEXCEPT {
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static_assert(!is_function<_Tp>::value, "_Tp is a function type");
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return __p;
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}
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template <class _Pointer, class = void>
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struct _HasToAddress : false_type {};
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template <class _Pointer>
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struct _HasToAddress<_Pointer,
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decltype((void)pointer_traits<_Pointer>::to_address(std::declval<const _Pointer&>()))
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> : true_type {};
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template <class _Pointer, class = void>
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struct _HasArrow : false_type {};
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template <class _Pointer>
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struct _HasArrow<_Pointer,
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decltype((void)std::declval<const _Pointer&>().operator->())
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> : true_type {};
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template <class _Pointer>
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struct _IsFancyPointer {
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static const bool value = _HasArrow<_Pointer>::value || _HasToAddress<_Pointer>::value;
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};
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// enable_if is needed here to avoid instantiating checks for fancy pointers on raw pointers
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template <class _Pointer, class = __enable_if_t<
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_And<is_class<_Pointer>, _IsFancyPointer<_Pointer> >::value
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> >
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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__decay_t<decltype(__to_address_helper<_Pointer>::__call(std::declval<const _Pointer&>()))>
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__to_address(const _Pointer& __p) _NOEXCEPT {
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return __to_address_helper<_Pointer>::__call(__p);
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}
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template <class _Pointer, class>
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struct __to_address_helper {
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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static decltype(_VSTD::__to_address(std::declval<const _Pointer&>().operator->()))
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__call(const _Pointer& __p) _NOEXCEPT {
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return _VSTD::__to_address(__p.operator->());
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}
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};
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template <class _Pointer>
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struct __to_address_helper<_Pointer, decltype((void)pointer_traits<_Pointer>::to_address(std::declval<const _Pointer&>()))> {
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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static decltype(pointer_traits<_Pointer>::to_address(std::declval<const _Pointer&>()))
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__call(const _Pointer& __p) _NOEXCEPT {
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return pointer_traits<_Pointer>::to_address(__p);
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}
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};
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#if _LIBCPP_STD_VER >= 20
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY constexpr
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auto to_address(_Tp *__p) noexcept {
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return _VSTD::__to_address(__p);
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}
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template <class _Pointer>
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inline _LIBCPP_INLINE_VISIBILITY constexpr
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auto to_address(const _Pointer& __p) noexcept -> decltype(std::__to_address(__p)) {
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return _VSTD::__to_address(__p);
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_POINTER_TRAITS_H
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